Thermostatic alarm



Oct. 13, 1931. BLQME 1,827,137

THERMOSTAT IC ALARM Filed March 21 1950 Invenlor flay Ljlanze w By 9mm A llomey Patented Oct. 13, 1931 UNITED. STATES 'HARRY L. BLOME, OF STONINGTON, ILLINOIS THERKOSTLTIC ,ALAIBCMI Application filed Iarch 21, 1930. Serial No. 437,918.

This invention appertains to new and useful improvements in electrical signalling, and more particularly to a novel thermostatic alarm for warning persons of an exceeding high or low temperature in a brooder or other place requiring an even constant temperature.

The principal object of this invention is to provide a thermostatic alarm including a thermostatic switch constructed in such a manner as to not be susceptible to the development of ready defects. f

Other important objects and advantages of the invention will readily become apparent to the reader as the specification pro- 16 ceeds hereinafter.

In the drawings Figure 1 represents a bottom plan view of the novel thermostatic switch.

Fig. 2 represents a side, elevational view of the switch and the electrical connections between the same and the source of current and annunciator.

Referring to the drawings wherein like numerals designate like parts, it can be seen that it is preferable that the thermostatic switch include a panel or some other suitable plate 5 of di-electric material. To the bottom side of this plate 5 are secured the spring arms 6, 7 and 8, each of which has a horizontally disposed portion which is referred to respectively by numerals 9, 10 and 11.

The horizontal portions 9 and 11 are provided with contacts 12 on the opposed sides hereof, each in opposition to a contact 13 on the opposite side of the horizontal portion 10 of the arm 7 These arms 6, 7 and 8 are secured to the panel 5 by bolts 14 and nuts 15, The panel 0 5 has an opening 16 therein in which engage the internally threaded bushings 17, through which the screw 18 is feedable. This screw is provided with a head 19 at its upper end and is secured at its lower end to the thermostatic wafer.

4 The lower end of the spring arm 7-is secured to the under portion of the wafer 20 as at 23. The free end of the horizontal portion 11 of the arm 8 is bent backwardly as 5 at 24 and the nut 25 is interposed between this portion 24 andthe opposed portion of the horizontal part 11 of the arm.

In this manner, the device is adjustable throughout to accommodate the same to a wide'range of temperatures. As is clearly shown in Fig.2, the battery 28 has a lead 29 extendin through the switch 30 to the arm 7, while 0th the arm 6 and the arm 8 are connected by the common wire 31 to one side of the annunciator 32, the opposite side of the annunciator or alarm being connected by the wire 33 to the negative side of the battery.

Thus, when the switch 30 is closed, a pre-.

determined temperature variation will result in the engagement of the contact 13 with either the contact on the arm 6 or the contact on the arm 8, in either case, resulting in the completion of the alarm circuit and the sounding of annunciator 32.

While the foregoing specification sets forth the invention in specific terms, it is to be understood that numerous changes in the shape, size and. materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having thus described my invention, what I claim as newis 1. A thermostatic switch comprising a sup port, a thermostatic element on the support, a contact arm carried by the thermostatic element, a stationary contact strip having one end-secured to the support, a threaded protuberance on the support, the opposite end of the contact strip being provided with a U- shaped formation, the opposed portions of the U-shaped formation being provided with registering openings through which the threaded protuberance extends, and a not on the threaded protuberance between the apertured portions of the contact strip.

2. A thermostatic switch comprising a support, a thermostatic element on the support, a contact arm carried by the element, a contact strip having one end secured to the support, the opposite end of the contact strip being provided with an opening, a threaded protuberance on the support extending through the opening in the contact strip, and a nut seatable on the threaded protuberance for urging the contact strip at its free end in a given direction.

In testimony whereof I aflix my si nature.

HARRY L. BL ME. 

